Channel Buffering {.en}

通道缓冲 {.zh}

::: {.en} By default channels are unbuffered, meaning that they will only accept sends (chan <-) if there is a corresponding receive (<- chan) ready to receive the sent value. Buffered channels accept a limited number of values without a corresponding receiver for those values. :::

::: {.zh}

默认情况下，通道是无缓冲的，这意味着只有在对应的接收（<-chan）通道准备好接收时，才允许进行发送（chan <-）。 可缓存通道允许在没有对应接收方的情况下，缓存限定数量的值。

:::

package main
import "fmt"
func main() {

::: {.en} Here we make a channel of strings buffering up to 2 values. :::

::: {.zh}

在这里，我们 make 了一个最多允许缓冲 2 个字符串值的通道。

:::

    messages := make(chan string, 2)

::: {.en} Because this channel is buffered, we can send these values into the channel without a corresponding concurrent receive. :::

::: {.zh}

因为这个通道是有缓冲区的，即使没有一个对应的并发接收 方，我们仍然可以发送这些值。

:::

    messages <- "buffered"
    messages <- "channel"

::: {.en} Later we can receive these two values as usual. :::

::: {.zh}

稍后我们可以照常接收这两个值。

:::

    fmt.Println(<-messages)
}

$ go run channel-buffering.go 
buffered
channel